Bad customer service and poor product quality

I bought a brand new Lenovo laptop which is under warranty. Within 3 months of purchase it developed a faulty with the disc error.took it in and only got it back after 4 weeks.2 nothing later it stopped working again and they told me they sent it back to suppliers and found out it needs a new mother board which has been ordered.its been 4 weeks no call from anyone.i have gone to the store and today realised that they did not even escalate the issue after 21 days had gone by.no call still.the laptop is going off warranty in 2 months time. Am not an expert at how refunds or replacements work but they refused to replace it nor refund me.I do not want that laptop back .I want my money back or they must replace it.Please help